I just came back from the Speed Challenge at the California Speedway near Los Angeles. I have a Kyosho Evolva with a stretched chasis and 3 x .21 engines installed. I clocked 88 mph on very short run and it didnt make 2nd gear. Read all about it on my blog

http://ziggy12345-myspeedattemptcar.blogspot.com/

There is a vid of the run

There is another class of cars that are plain kits with big motors in but no mods to the length or width and I want the 18 for this class. I will gear it for 125mph. A .21 big block motor will not fit without moding the chasis so I need a small block.

The power required to propel a car weighing 1 kg up to 150 mph in 12 seconds in 1320ft is around 2.3 hp. The 18TZP was dynoed at 2.86 so in theory you can get 150 but in practice 120 might be almost impossible.

Cheers